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On 05/10/2015 18:25, Stroller wrote: |
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> |
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>> On Sun, 4 October 2015, at 11:38 p.m., Alan McKinnon <alan.mckinnon@×××××.com> wrote: |
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>> |
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>>> I see that the ffmpeg ebuild requires that mmxext is set if sse is set. |
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>>> |
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>>> Isn't mmxext amd-only? |
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>> |
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>> Definitely not. Intel designed mmx |
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> |
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> The ffmpeg has both "mmx" and "mmxext" USE flags - presumably they're not the same thing. |
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Correct. mmxext is AMD's set of extensions to standard mmx. |
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Useful stuff from mmxext later made it's way into sse. |
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http://softpixel.com/~cwright/programming/simd/mmxext.php |
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> |
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> CPU_FLAGS_X86="3dnow 3dnowext avx avx2 fma3 fma4 mmx mmxext sse sse2 sse3 sse4_1 sse4_2 ssse3 xop" |
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> |
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> My AMD Neon supports both. |
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-- |
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Alan McKinnon |
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alan.mckinnon@×××××.com |
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